Shamrok

Bare with me, this is my fist "big" job by myself. The other night I had a coil 5 misfire. Changed the coil and plug and it was fine. The next morning driving to work another coil went, this time it said 6. I changed the coil and plug. Now the reader is saying "ignition coil F" I talked to a mechanic and he says it's possible the Bosch plugs are the issue. Any insight would be helpful! I can't get another car until tomorrow but I do plan on getting Motorcraft plugs and trying them.